661's Power Stretch fabric is a specific polyester blend that helps wick away moisture, and cool the rider with its evaporative properties. The material performs better than traditional pressure suit materials because of its moisture management capabilities.

Neck Brace Compatible
Certain technologies work better if the supporting products are designed to work in conjunction with each other. Neck braces are one of those technologies that need products design specifically to work with other safety equipment. Certain helmets, chest protectors, and roost deflectors are designed to work in conjunction with a neck brace to maximize comfort, fit, and motion.

Side Zip Panel
Side zip paneling allows the chest piece of a pressure suit to be one piece. That one piece has the ability to do a better job of protecting the vital zone of the chest including the sternum.